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Synthesis, structure, spectroscopic and magnetic characterization of a novel spin-crossover iron(II) complex with 1-cyclopropyltetrazole ligands |
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| Authors: | Ahmed A Soliman Mohamed M Khattab Peter Weinberger Wolfgang Linert |
| Institution: | a Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt b Department of Chemistry, Faculty of Science, UAE University, Al-Ain, United Arab Emirates c Institute for Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/138, A-1040 Vienna, Austria d Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9-163AC, A-1060 Vienna, Austria |
| Abstract: | For the first time a 1-cyclopropyl substituted tetrazole (C3tz) has been used as a potential ligand for iron(II) spin-transition complexes. The complexation of 1-cyclopropyltetrazol with iron(II) tetrafluoroborate yielded a fine powdered product of Fe(C3tz)6](BF4)2 being poorly soluble in most common solvents. Single crystals of complex were grown in situ from a solution of ligand and iron(II) hexafluorophosphate, which yielded a hexagonal prismatic crystalline product of Fe(C3tz)6](PF6)2. A comparison of XRPD data of the homologues Fe(C3tz)6](BF4)2 and Fe(C3tz)6](PF6)2 proves them to be homeotypic. The thermally induced spin-crossover phenomenon of Fe(C3tz)6](BF4)2 complex shows very abrupt spin transitions, with a spin-crossover temperature T1/2 ≈ 180 K which is found to be ≈50 K above the T1/2 of all known iron(II) complexes with n-alkyltetrazoles as ligands. The T1/2 was determined by temperature-dependent 57Fe-Mössbauer, far FT-IR and UV-Vis-NIR spectroscopy as well as temperature dependent magnetic susceptibility measurements (SQUID). |
| Keywords: | Spin crossover (SCO) 57Fe-Mö ssbauer SQUID X-ray diffraction Far FT-IR Spin transition Iron(II) Cyclopropyltetrazole |
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